Let the Light into the Letters

Generate exactly one image. Intended aspect ratio 3:4. A minimal cinematic typography poster with exact words "LET LIGHT IN" in large cream capitals aligned left in three lines. A real sunbeam projected through a small arched window cuts diagonally across matte indigo plaster, illuminating parts of the letters and a single fallen yellow leaf below. Texture and shadow remain refined and materially convincing, high readable contrast, asymmetrical breathing room. No other writing, people, brands or watermark.